Study on seismic performance of RC frame structure under four performance objectives

The seismic resistance capability of RC frame structure was studied with incremental dynamic analysis(IDA) method in terms of the 4 performance objectives(frequent seismic design of class C,frequent seismic design of class B,non-yielding design under moderate earthquake and elastic design under moderate earthquake).Taking frequent seismic design of class C as basis,results of IDA analysis indicate that both seismic measures and seismic design force are very important influencing factors on seismic performance.The RC frame structures that are designed strictly conforming to the Chinese seismic design code have enough safety margins and the performance level of 'non-collapse under rare earthquake' can be reached.When the fortification intensity is 6,improving seismic measures for frequent seismic design of class C or increasing seismic design force for moderate seismic design has little influence on seismic performance.When the fortification intensity is 7,the collapse resistance capability of RC structures designed under moderate seismic force can be improved obviously.When the fortification intensity is 8,both improving seismic measures and increasing seismic design force can significantly raise the seismic resistance capability of RC frame structure.Especially,designed under moderate earthquake,the RC frame structure can withstand PGA of 1 000 gal without collapse.